Protective mask



FIG. 1 is a front perspective view of an embodiment of a protective mask according to our invention;

FIG. 2 is a front elevational view of the design shown in FIG. 1;

FIG. 3 is a right side elevational view of the design shown in FIG. 1, the left side being a mirror image thereof;

FIG. 4 is a top plan view of the design shown in FIG. 1; and,

FIG. 5 is a bottom view of the design shown in FIG. 1.

All broken lines appearing in the drawings form no part of the claimed design. 

CLAIM The ornamental design for a protective mask, as shown and described. 